Pattern for dovetailed snugs



A. RANSOM & M. OASSIDY. Pattern for Dovetailed Snug.

No. 223,540. Patented Jan. 13, 1880.

N. PETERS, PMOTO-LITHDGRAPHER WASHINGTON D C UNITED STATES PATENT ()FFICE.

ALBION RANSOM, OF LOUDONVILLE, AND MICHAEL OASSIDY, OF ALBANY, NEW YORK.

PATTERN FOR DOVETAILED SNUGS.

SPECIFICATION forming part of Letters Patent No. '223, 5IO, dated January 13, 1880. Application filed November 8; 1879.

To all whom it may concern Be it known that we, ALBION RANSOM, of Loudonville, and MICHAEL OAssIDY, of Albany, both in the county of Albany and State of New York, have invented certain new and useful Improvements in Patterns for (lasting Dovetailed Snugs, of which the following is a full and exact description, reference being had to the accompanying drawings, making a part of this specification, in which Figure 1 is an end elevation; Fig. 2, a perspective view of plate with abutments; Fig. 3, a perspective "iew of detachable angle-piece; Fig. 4, a front view of same; Fig. 5, a crosssection at the line 0000; and Fig. 6, aplan view of plate with abutments having detachable angle'pieces in position.

Our invention especially relates to patterns for making the bottom plates of stoves, which plates, when cast, are commonly provided with dovetailed snugs for holding the stove-legs.

These songs have heretofore been produced by means of patterns made in the form of the entire snug, which were detachable from the plate-pattern, and held in place thereon by dowel-pins, which entered holes made in the plate-pattern. These pins and holes become Worn so quickly that no reliance can be placed on this mode of holding the detachable patterns for producing a uniform space between the snugs in a number of castings from the same plate-pattern. From this cause manufacturers have been subjected to great trouble and expense in properly fitting the stove-legs to their places. To remedy this defect is the object of our invention; and to this end our invention consists in fixing on the principal pattern stationary abutments adapted to receive and hold in a reliable manner detachable patterns that, conjointly with the abutments, form the dovetailed snugs, as hereinafter set forth.

As illustrated in the drawings, A represents the principal pattern for aplate or other article, provided with the stationary abutments B. These abutments are arranged in pairs at the required distance apart, and at any suitable angle to each other. Their inner faces should be made with a bevel, as shown in the drawings, so that the detachable patterns will be readily relieved therefrom. Each of said abutments has a depression, 1;, formed therein to receive the tongue-piece of the detach able pattern. a O are detachable patterns, each of which 5 5 forms a complement of a dovetail snug. Each has its back made to conform to the bevel 0f the face of the abutments B and its face made to the angle required for the dovetail.

A ton gue-piece, 0, made to fit the depression y b of the abutments, extends from the back of each detachable pattern, and is provided with a pin, 0, which enters the slotted hole I) in the abutments and retains the detachable pattern snugly to its place against the face of the abutment.

The tongue-piece c, in addition to its function of holding the detachable pattern against the abutment, also serves to equalize the pressure of the sand while the mold is being rammed, and prevents the pattern 0 from rocking forward to destroy the truth of its position.

In making the detachable pattern O of metal (the material we preferably use for that purpose) it becomes necessary to lighten and fashion it so that its weight, by overcoming the retentive strength of the sand in the mold, will not cause it to drop from its place. To that end we cut away the central part, as shown at 0 and by enlarging the out below the top line of the pattern, as shown in Fig.

4, form an under-cutthat gives to the sand additional hold on the pattern. Other undercuts, 0 are also made at each end of the de tachable pattern,for the purpose of lightening the pattern and giving to the sand a better hold of it. These several under-cuts should be made in such form that, while they prevent the pattern from falling or being drawn at right angles to the face of the principal pato tern, they will ofier no obstruction to drawing the detachable pattern backward, as it should be drawn.

If, in addition to the cuts described, it becomes necessary to further lighten these pat- 5 terns, it may be effected by cutting out any i of the surfaces where the external form of the snug will not be afiected.

When the detachable patterns 0 are made of wood or other light material the neces- 10o sity for lightening and under-cutting will not exist.

In molding, the detachable patterns Gare placed in position. against the abutments B, where they are securely held by the sand that is press d between them in tucking the dove 5 tails, and the abutinents resist all tendency to force the detachable patterns from their true position while the sand is being rammed between them.

On removing the cope from the mold the 10 detachable patterns are lifted from the abutments by the sand in the cope, and are separately drawn therefrom, leaving the dovetail snugs perfectly molded, and in such mannor that the distances between them will be r5 uniform in all castings made from the same pattern. v

We claim as our invention- 1. The combination, with a principal pat Witnesses WILLIAM H. Low,

E. F. BENHAM. 

